'The ADVERSARY' — Hebrew ha-satan is not originally a name but a job description, the one who opposes or brings the accusation; in Job he appears among the sons of God as a kind of prosecutor, and in Zechariah 3 he stands to accuse the high priest. The Greek Old Testament renders it DIABOLOS, 'slanderer', which is where English 'devil' comes from. ⚠ In Matthew 4 both words sit side by side: the narrator calls him 'the devil' and 'the tempter', and when Jesus finally addresses him directly he uses the Hebrew adversary-name — 'Go away, SATAN' (4:10). ⚠ Matthew then puts those same words in Jesus' mouth once more, at 16:23, to PETER, when the disciple tells him he must not suffer: 'Go behind me, Satan.' The name attaches not to a monster but to whoever offers the shortcut. Scripture is markedly reticent about his origin; the familiar biography (a fallen angel of light) is assembled largely from Isaiah 14 and Ezekiel 28, passages whose stated subjects are the kings of Babylon and Tyre — a later synthesis rather than a claim of the text. ⚠ Revelation 12:9 is the first place in the whole Bible where the serpent of Genesis 3 is named outright as this same figure — 'the great dragon... the ancient serpent, the one called Devil and Satan' — an identification centuries of later readers simply assumed, made explicit in the text for the first time here, on the very chapter that also puts the serpent's own head under a heel (Genesis 3:15).